Abstract: In remote areas where power grids are difficult to reach, electricity consumption for residents’ lives and field projects faces enormous challenges. Aiming at these above problems, an AC/DC independent optical storage power supply system composed of multiport converter, photovoltaic panel and battery pack is proposed. The multi-port converter includes a Boost converter at the input terminal, a bidirectional Buck-Boost converter at the energy storage terminal, a three-phase inverter at the AC output terminal, and an isolated DC/DC converter at the DC output terminal. The input terminal uses a control strategy based on duty cycle disturbance to achieve photovoltaic maximum power tracking(MPPT); the isolated DC/DC converter uses voltage closed-loop single-phase shift control to achieve DC output of 0-200 V; the three-phase inverter uses voltage and current double closed-loop control to achieve three-phase AC output 380 V/50 Hz. In the control strategy of the energy storage end, the current inner loop of the traditional voltage and current double closed-loop control strategy is improved to the power error inner loop to realize the direct control of the active power transfer of the system. The simulation shows that the system can achieve stable power supply under both environmental changes and load abrupt changes. At the same time, the improved control strategy can effectively reduce the voltage fluctuation amplitude and transient response time of the DC bus under the sudden change of light intensity, which is more advantageous in maintaining the power supply stability of the system.